JPH03275412A - Automatic plastic film packing machine - Google Patents

Abstract

PURPOSE: To wrap a small load with plastic film by providing a positioning element for the load, a gripper for holding the plastic film, a cutter for the film, and an actuating device, in a turn-table. CONSTITUTION: When a gripper 5 is positioned in a seat 2b, and a load 65 is put on a turn-table 2 so that the front side comes into contact with the gripper 5 and one side part thereof comes into contact with a fixing and positioning element 3, the turn-table 2 is lowered by the own weight of the load 65, and a movable positioning element 4 is parallelly transferred at the end of the actuating process of the turn-table by the movement obtained by racks 9, 10 and a double gear 11. In this time, as the turn-table 2 rotates by a specified number, the load is wrapped up in the plastic film 6. Then, the plastic film 6 is cut off by a blade 44 and subsequently, the gripper 5 holds a new edge of the plastic film 6 at the upper closing position separated from the turn-table 2 and makes it possible to hoist the suitcase 65 wrapped up in the plastic film 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an automatic plastic film wrapping machine, and in particular to an automatic plastic film wrapping machine of the type equipped with a turntable, suitable for wrapping suitcases.

[Conventional technology]

BACKGROUND OF THE INVENTION Packaging machines with turntables are known from the prior art, which are suitable for wrapping rectangular or other parcels by wrapping around them with a suitable plastic film.

In the most well-known example, the machine consists of a turntable on which the load to be wrapped is placed, and a film gripper is fixed to the turntable, so that when the turntable is started, the plastic film is removed from the reel. Unwinding and packaging of the baggage are now carried out at the same time.

After a predetermined number of revolutions or after the end of wrapping, the film is cut by a suitable device so that the wrapped item can be moved translationally from the turntable. Typically, the packaging machine is designed to handle large and/or heavy loads.

On the other hand, when packaging lightweight and/or unstable loads, the machine is equipped with a pressurized top plate to stabilize the load along the vertical axis of the turntable. This system of vertical pressure prevents the load from shifting or tipping over during the packaging cycle, but requires the load to be oriented as far as possible axially on the table. Naturally, such machines are suitable for light and small loads, such as personal suitcases, which are usually commercially available, and in addition they require operation by skilled personnel. There is.

[Problem to be solved by the invention]

The object of the invention is to equip the machine with a turntable which is particularly suitable for wrapping suitcases or similar parcels with a plastic film.

Another object of the invention is to minimize the overall dimensions so that the machine can be used even in confined spaces.

[Means to solve the problem]

The above and other objects mentioned below can all be achieved by the automatic packaging machine according to the present invention, which has a main body coupled with a turntable and is suitable for holding the load fixed during the packaging cycle. A gripper for gripping a plastic film formed by two positioning elements (a fixed element and a movable element), two sliding plates whose opening and closing are controlled by two connecting cams, and a toothed gripper fixed to a support. characterized in that it comprises a cutting device formed by a blade for cutting during either the forward phase or the reverse phase of the blade itself, and an electromechanical device for rotating said turntable and actuating the plastic film cutting device. shall be.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

The packaging machine according to the invention has a suitably shaped main body l coupled with a turntable 2 having suitable characteristics, on which a fixed positioning element 3 and a movable positioning element 4 are arranged, and on which the turntable 2 is arranged. A gripper 5 for gripping a plastic film 6 is fixed to the table 2 through a slot 7.

The turntable 2 is provided with a slot 2a that allows movement of the movable positioning element 4, which slot 2a forms a working field of the positioning element 4 with a predetermined length and is fitted with a suitable recess. 2b is the gripper 50 seat during the operating phase of the packaging machine.

A shaft 8 and a vertical rack 9 are fixed to the turntable 2, and the rack 9 is connected to a support 13 via a plate 12.
It is connected to the horizontal rack 10 by a double gear 11 fixed to the horizontal rack 10.

A horizontal rack 10 has a horizontal slide 1 fixed to a support 15.
4, the movable positioning element 4 is connected to the horizontal rack 10 via a metal strap 16 and a plate 17. The support 13 is provided with a suitable hole so that the shaft 8 can be slid vertically in a pipe 18 which also serves as a seat for the spring 19.

A pipe 20, in which a shaft 8 rotates, the rotary movement of which is transmitted by a through pin 21, rotates is firmly fixed to said support 13. The pipe 20 is fitted with a tapered bearing 23 that allows rotational movement of the turntable 2 about its vertical axis.
It is inside the pipe 22 connected by a and 23b.

The pipe 22, which is firmly fixed to the frame 1a of the main body 1, interacts with the third vibe 24 by means of Taber bearings 25a, 25b. A pulley 26 attached to the pipe 22 via a groove makes it possible to transmit rotary motion to the turntable 2, and a pulley 27 makes it possible to transmit motion to the pipe 24 connected thereto. A horizontal cam 28 to which a vertical cam 29 is welded is fixed to the pipe 24, and the cam 29, which has a suitable shape, is attached to the plate 5a forming the gripper.
The gripper 5 is actuated via the arm 30 which supports the trunnion 31 which is inserted between the pair of small pins 32a-32b and 32cm32d fixed to the guides 33a and 5b and slides within the guides 33a and 33b.

An arm 30 fixed to the plate 34 via a pin 35 has an edge 36 that slides on the vertical cam 29 (
FIG. 6 shows only an outline of the functional principle of the components shown in FIG. 5).

Said plate 34, which is capable of translational movement by means of a flat guide, is connected to an element 37 fixed to the support 13 and is provided with a roller 38 in contact with the horizontal cam 28.

Spring 39.40 is connected to horizontal cam 28 and roller 38,
and ensuring continuous contact between the vertical cam 29 and the edge 36 so that the movable device 30.34 has the same return function.

The functionally fundamental component of the machine according to the invention is a cutting device for a plastic film 6, in which case the film 6 is mounted on a reel holder 42 fixed to the frame 1a and loosely attached to the frame 1a by means of bushings 43. - It is rewound from the wheel 41. The cutting device consists of a toothed blade 44 with double cutting edges, the upper part of which rotates about its own axis in a given circular sector and supports 46a, 46b. The molded rod 45 is fixed to the upper part of the molded rod 45, which is fixed to the frame la. A pin 47 is provided at the bottom of the molded rod 45, one end of a spring 48 is fixed to the pin 47, and the spring 48 is connected to a pulley 49 operated by a toothed belt 50 via a pulley 51 coaxially attached to a pulley 52. Secure the other end. In this case, the pulley 52 is a belt 53 driven by a geared motor 54 to which a grooved pulley 55 having three grooves is connected.
It is activated by Pulleys 26 and 27 are respectively bell) 5
6.57 by the grooved pulley 55. A belt tensioner 5 is used to accurately maintain the tension of the belt 53.
8, the pulleys 49, 51 and the belt 53 are fixed to the frame 1a by supports 59 and 60. To complete the cutting device, a levered opening device 61 operated by an electromagnet 62 is provided. plastic film 6
Connected idle rollers 63a-63b and idle roller 64 are provided to stretch the film to enable accurate rewinding of the film.

Figure 9 shows an outline of the operating phase of the machine. FIG. 9a shows the start-up phase of the machine, showing the turntable 2 without load (in the upper position due to the spring 19) and the gripper 5 holding the plastic film 6. FIG. FIG. 9b shows the next phase in which the gripper 5 is positioned on the seat 2b and the load 65 is placed with its front side in contact with the gripper 5 and one side in the fixed positioning element 3. When placed on the turntable 2 so that they touch each other, the weight of the load 65 itself causes the turntable 2 to descend, and the motion provided by the rack 9, 10 and the double gear 11 causes the turntable to move through the travel. At the end, there is a translation movement of the movable positioning element 4 which abuts the side of the suitcase 65 opposite to the part supported by the fixed positioning element 3. The load is thus stable and does not tip over during the rotation of the turntable 2 and during wrapping with the plastic film 6. At this time, the turntable 2 rotates a predetermined number of times, so that the phase of wrapping the luggage with the plastic film 6 is started.

FIG. 9C shows the phase in which the gripper 5 lowers and opens to release the plastic film 6; such movement is carried out by a cam via the movable devices 30.34 and auxiliary parts operatively connected thereto. This will be carried out through a collaborative effort of 28.29.

9d shows the gripper 5 in its lowered position, open and away from the turntable 2, while the phase in FIG. 9e shows the gripper 5 in the upper closed position, with the plastic film 6 cut by the blade 44 and away from the turntable 2. At this point, the gripper 5 grips the new edge of the plastic film 6.

In this phase, the suitcase 65 wrapped in the plastic film 6 can be lifted without causing the suitcase 65 to accidentally open and its contents spill out, and at the same time protect the suitcase 65 from various accidental impacts or scratches. protect from

A plastic film 6 on the bottom of the suitcase 65 to better protect the lower part of the suitcase 65.
The turntable 2 is tilted to improve the adhesion of the plastic film 6 during packaging
When the suitcase 65 is lifted from the turntable 2, the spring 19 returns to the position shown in FIG. 9f as in FIG. 9a.

For a better understanding of the invention, please refer to Sections 9a-b-c.
-def diagrams schematically show the positions of the turntable 2 and the gripper 5 with respect to the axis of the turntable itself.

The machine of the invention is provided with a control box 66 such that the machine is activated by a bush button device after insertion of a ticket or coin or card.

The objects of the invention are all achieved by the device according to the invention, which makes it possible to wrap a plastic film around suitcases of various sizes in order to guarantee the necessary protection. Any maneuvering method that does not require skilled personnel;
Since the machine and parts are conceivable, the machine of the invention can be used in stations, ports, airports etc. where large quantities of suitcases are handled.

Although the invention has been described in detail above, various variations and modifications can be made without departing from the scope of the invention. In fact, the shapes and dimensions of the parts, their operative links, and the materials used may be of any design as required and without departing from the scope of the invention as claimed. The details can also be replaced with equivalent ones.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the machine without luggage; FIG. 2 is a perspective view of the machine with suitcases during the plastic film wrapping cycle; FIG. 3 is a plan view of the luggage support turntable with positioning elements. Figure 4 is a schematic cross-sectional view of a turntable with related devices; Figure 5 is a schematic partial cross-sectional view of a control device for the turntable and a gripper for gripping plastic film; Figure 6 shows the gripper with a driving gear. Figure 7 is a schematic diagram of the plastic film cutting device; Figure 8 is a schematic diagram of the motion chain capable of driving the main equipment; Figure 9 shows the main operating phases of the gripper, the turntable load, the plastic film, and the cutting equipment. It shows the relative position to. DESCRIPTION OF SYMBOLS 1... Main body, 2... Turntable, 3... Fixed positioning element, 4... Movable positioning element, 5... Gripper, 6... Plastic film,
7... Slot, 8... Shaft, 9.10... Rack, 11... Gear, 12.17.34... Plate,
13.15...Support, 14...Slide, 16.
...Strap, 1B, 20, 22.24...Pipe, 19,39.40.48...Spring, 21.35...
・Pin, 23.25... Bearing, 26.49, 51, 5
2.55... Pulley, 28.29... Cam, 30...
・Arm, 31...trunnion, 33...guide,
38...Roller, 41...Reel, 50, 53, 5
6.57...Belt, 58...Belt tensioner, 63
．． 64... Idol roller. Figure 4

Claims (9)

[Claims] (1) It has a main body connected to a turntable on which the load to be packaged is placed, and the turntable has a positioning element for stabilizing the load in the lateral direction, a gripper for gripping the plastic film, and an end of the packaging cycle. Automatic plastic film particularly suitable for wrapping suitcases, characterized in that it is provided with a device for cutting the plastic film at a machine and an electromechanical device for rotating a turntable and activating the film cutting device. packaging machine. (2) At least one of the two positioning elements is movable and its translational movement is coupled with the vertical movement of the turntable on which the load to be packaged is placed.
) Automatic plastic film packaging machine described in ). (3) Automatic plastic film wrapping machine according to claim 1, characterized in that the gripper is formed by two plates sliding via a lever device into a guide which is opened and closed by two connecting cams. (4) The automatic plastic film wrapping machine according to claim 3, wherein one of the cams is horizontal and parallel to the turntable, and the other is perpendicular and perpendicular to the turntable. (5) The automatic plastic film wrapping machine according to claim 3 or 4, wherein the cam is suitably shaped to ensure opening of the plastic film after the turntable has rotated a predetermined number of times. (6) the gripper moves away from the turntable by means of a lever device and a slide actuated by the cam, grips a new edge of the film and is then immediately ready to cut the film wrapping the package; Automatic plastic film wrapping machine according to any one of the preceding claims (1) to (5), characterized in that it is necessary to pick up wrapped packages from the turntable itself. (7) Since the turntable and the cam rotate at different angular velocities, the operating phase of the gripper can be precisely continuous with respect to the rotation of the turntable and the necessity of cutting the plastic film. The automatic plastic film packaging machine according to any one of 6). (8) the cutting device is formed by a suitable toothed blade fixed to a rotatable support in a predetermined circular sector;
Automatic plastic according to any of the preceding claims (1) to (7), wherein the support operates via a mechanism such that the cutting is possible during either the forward phase or the reverse phase of the blade itself. Film wrapping machine. (9) The automatic plastic film wrapping machine according to claim 8, wherein the upper end of the blade itself is fixed to the support, so that the gripper can be closed and the blade itself can cut the film.